Hi BIll, The C2000 is an early version of the C3000 tire - both of these are kevlar belted tires made from the same moulds as the "standard" tire, but tend to run larger in diameter due to the stiffer belts. The kevlar tires are lighter, and dissipate heat a bit better, as they don't need as much rubber to bind them together. They also last several more heat cycles . As for compounds between makes, every tire is going to behave differently from different manufacturers, but we have found the 45's to be a tiny bit "softer" than the 430's, and the 35's to be a tiny bit "harder" than the 250's. Then there's the 25's, 190's, 160's, etc.etc.... Hoosier has made a new mould this year for the C3000 tires, to bring them back to the sizes of the earlier "standard" tires. They also have reworked the shoulder area based on info from last years tires. I'm not aware of any updates to the Goodyears at this time, but I'm not really in the loop on that!

Thanks for contacting us. First, the 43155 - 20.0x7-13 tire is our firstgeneration of road racing slicks using nylon materials to construct thistire. We have been using this design for years. The 43157-20.0x7.0-13 C2000is the second generation using kevlar and nylon materials to construct thistire. This combination is more competitive to the all nylon or firstgeneration of tires.After doing some testing, we found the higher down force club cars(FC, FA,S2) needed a stronger sidewall, thus we added another ply of kevlar and nowhave the C3000.The 43157-20.0x7.0-13 C2000 is recommended for use on a Formula Ford only.The 43155-20.0x7.0-13 can be used on any vehicle.Your second question, the ACRL tire was used in a spec tire rule seriescalled the American City Racing League. The cars were S2000 type cars. Thecompound is exactly the same as the R45.

So is there a chart that compares the two companies compounds for a soft, medium and hard tire? And even if there is the chart, does anyone have experience that would say one tire in a given category seems to grip better or be more durable?

There is no magic chart that tells you the best tire for grip/durability.

It all very much depends on the track surface, chassis setup, and driver feel/preference. To do this test properly, you need to buy new tires of each brand, and run them back-to-back keeping as many variables the same as possible (fuel load, weather conditions, driver bravery).

To see if you have the right compound for the track temperature, you will need to measure the tire temperature. If the tire is't coming up to temperature, you will need to try a softer compound.

Yes this is an expensive and time comsuming undertaking.

Now, if this sounds like just too much, my advice is pick the tire brand with the best support in your area (Avon, Goodyear, Hoosier), run it all the time, and get you car setup to get the maximum from the tire. Learn what compounds to use for given tracks/conditions.

1320 lbs S2, 6&8" rims, 20x7x13 and 22x9x13 tires, runs Hoosier R45, Goodyear R250, and Avon A11 or A24 on West Coast tracks. Typical life is 4-6 heat cycles. On any given day one of these tires (not the same one) can be 1 second per lap faster.